Drive-clamp



UNITED TA S- OFFICE- ALBERT wnnno BROWN, or FULLERTON,'CA1LIFORNIA, ASSIGNOR T CAROLINE 11.. R.

. BROWN, or FULLERTON, CALIFORNIA.

DRIVE-CLAMP.

Specification of Letters Patent.

Patented Nov. 15, 1921.

Application filed October 25,1920. Serial No. 419,558.

To all whom it may concern Be it known that I, ALnnirr Wnnoo BROWN, a citizen of the United States, residing at Fullerton, in the county of Orange and State of California, have invented new and useful Improvements in Drive-Clamps, of which the following is a specification.

. My invention relatesto drive clamps, and is particularly adapted to be clamped to an oil well'tool suspended from a cable and to be utilized for driving a wellcasing into a well. a a

j The object of my invention is to provide a clamp for the above recited purpose which will be simple and durable and may be quickl and securelyyclamped to a tool suspende from'a cable or readily disconnected j. therefrom, without disconnecting the cable from the tool, and which whenclamped to the tool will become in effect an integral part thereof.

Another objectoi" my inventionis to pro- .QViClG a clamp which may be readily and elliciently adjusted and clamped to the shanks of tools of variouslsizes and cross sectional shapes.

A further object of my inventlon is to a provide a clamp inwhich no exposed threaded parts or bolts are used, thereby avoiding the objection and difficulty of adjusting the clamp when the exposed threaded members become burred or j ammed.

Other objects will appear in the following description, will be pointed out in the claims, and embodied in the accompanying drawings in which: j I

Figure 1 is a vertical section illustrating the top end of a well casing and the top end of a well drilling tool projecting therein, having my improved clamp secured thereto. Fig. 2 is a transverse section of the same, taken approximately on the line 2-2 of Fig. 1, viewed in the direction indicated by the arrows, parts being broken away to more clearly show the construction.

Fig. 3 is a transverse section of the clamp taken on the line 3-3 of Fig. 2, viewedin the direction indicated by the arrows.

After an oil well hasbeen drilled to sufficient depth, the drill 5 is litt'ed'out of the same by means of a cable (not shown) attached to its upper end 6, and the well casing 7 is inserted into the well. A drive clamp 8 is then secured to the upper end of the tool 5, which is inserted into the well casing 7 through the bore 9 of a blow receiving p ug 10 threaded or otherwise secured to the top of said well casing. The drive clamp is then disposed above the oil well casing 7 andmay be lifted and lowered to strike a blow on the top of said casing.

The drive clamp 8 which embodies my invention, comprises a driving member 12 preferably formed of a thick piece of wrought iron or steel, the area of which is greater than the area of the pipe to he driven, and is of yoke form, having'the crown end 13 provided with a pair of op positelydisposed outwardly extending arms 14 and 15; j

The opposed inner faces of arms 14 and 15 are provided with grooves 16, and the inner surface of end 13 is also provided with a groove 17 joining grooves 16. The crotch 18 formed at the crown end 13 is provided with a V shaped notch in which one side of the tool shank 19 engages. A. block 20 is adapted to slide in the space between the arms 14 and 15 and is guided therebetween by means of tongues 21, which engage in the grooves 16, and has formed at its inwardly disposed end a V shaped notch 22. in which the opposite side of the tool shank 19 rests. Theoutwardly extending endsoii arms 14 and 15 are provided with oppositely disposed rectangular apertures 22 and 23, and the block 20 is also provided adjacent its outer end with a rectangular aperture 24, which is of the same width and somewhat longer than apertures 22 and 23 and is adapted to register therewith.

In order to firmly grip the tool shank 19.

firmly between the jaws 18 and 22 and to lock the clamp thereto, I providea gib 25, which is inserted in the apertures 22, 24 and 23, and interposed between the inwardly projecting face 27 of aperture 24 is a plurality of spacingbars 28. A tapered cotter pin 29 is passed through the apertures 22, 24 and 23, and its inner surface engages with the outer surface of gib 25 and its outer surface engages with the inner end walls of apertures 22 and 23.

The spacing bars 28 are adapted to slide in the grooves 1.6, and any number of the same may be employed, thus it it is desired to adjust the clamp to a shank of smaller dimensions than the one shown in the drawings, more of these bars may be inserted, and when the clamp is adjusted to a shank been adjusted to the tool of larger dimensions one or more of these bars may be removed. When the clamp has shank, all of the parts may be firmly locked in position by means of the set screw 30, which is threaded into an aperture in one of the arms 14 or 15, and is adapted to engage with the cotter pin 29.

In the several views of the drawings, the drive clamp 8 is shown in clamped and operative position on the drill 5, and is disposed directly below a shoulder 81 thereon, adapted to receive the thrust of said clamp when it delivers a blow to the casing end, the wedging action of the cotter pin 29 servingto firmly bind the tool shank 19 bet-ween the block 20 and the crown end 13 of said ciamp, and the set screw preventing the cotter pin 23 from becoming displaced by the 'severe vibration and jar encountered during the driving operation.

When it is desired to quickly remove the clamp from the drill, the set screw 30 is loosened, the cotter pin 29 is then driven out of the apertures 23 and 22 and then the gib 25 is removed from said apertures, the block 20 and bars 28 are then removed from between the arms let and 15. The hammer may be then readily drawn sidewise from off of the tool shank 19 without in any manner disturbing thecable attachment.

By the above described construction it will "be seen that I have provided an extremely efficient and rapid means of securing the drive clamp to the tool stem without the employment of any exposed threaded bolt ends or any other exposed threaded parts, which are likely to become burred or jammed and therebyfcause endless delay in removing or applying the same, and that my drive clamp may be readily and efii- -ciently applied to tools having shanks of var ous dimensions and shapes.

What I claim is:

1, A drive clamp, comprising a driving member provided with a head having a pair "of oppositely disposed apertured arms extending therefrom, an apertured block slidably mounted between said arms, and means engaging the apertures in said block and arms for holding said block and head in gripped relation with a tool shank.

2. A drive clamp, comprising a driving member provided with a head having a pair of oppositely disposed apcrtured arms extending therefrom, said head being provided with a notch at the junction of said arms, a block slidably mounted between said arms provided with a notch opposing the notch in said head, and a tapered cotter pin adapted to pass through the apertures in said arms and block for relatively moving said block and head.

3. A drive clamp, comprising a driving member provided with a head having a pair of oppositely disposed arms extending therefrom provided with oppositely disposed transverse apertures in the ends thereof, a block adapted to be slidably guided between said arms having a transversely disposed aperture therein, a plurality of bars mounted in said second mentioned aperture and adapted to slide with said block, a gib adapted to pass through all of said apertures and rest against one of said bars, and a tapered cotter pin adapted to pass through all of said apertures and rest against said gib.

4. A drive clamp, comprising a driving member of yoke form, the oppositely disposed faees of the yoke arms being provided with longitudinally extending grooves, an apertured block, each of its side edges being provided with a tongue adapted to engage the grooves formed in the yoke arms, and means for holding said block and driving member in clamped relation with a tool.

In witness that I claim the foregoing I have hereunto subscribed my name this 15 day of October, 1920.

ALBERT XVALDO BROWN. lVitnesses:

H. L. USTICK, H. C. Foss. 

